Advanced Relational Databases
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Questions and Answers

What is a primary key in a relational database table?

  • A candidate key selected as the primary means of identifying rows in a table (correct)
  • A combination of one or more columns used to identify rows in a table
  • A key that determines all of the other columns in a table
  • A key that consists of two or more columns

    • What is the purpose of normalization in relational databases?

  • To avoid redundancy (correct)
  • To minimize data consistency
  • To increase data duplication
  • To complicate data storage

    • What is a composite key in the context of database design?

  • A key that determines all of the other columns in a table
  • A candidate key selected as the primary means of identifying rows in a table
  • A combination of one or more columns used to identify rows in a table
  • A key that consists of two or more columns (correct)

    • What does it mean for a column to have 'nullability' in database table design?

    <p>The column may contain null values</p> Signup and view all the answers

    What does it mean for a table to be in 'first normal form' (1NF)?

    <p>Each cell of the table holds a single value, but duplicate rows are allowed</p> Signup and view all the answers

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